/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #6b7280;
    --color-secondary-hover: #4b5563;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-bg: #f9fafb;
    --color-card: #ffffff;
    --color-border: #e5e7eb;
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --font-mono: 'SF Mono', 'Monaco', 'Consolas', monospace;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* ============================================
   Layout
   ============================================ */
header {
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem 2rem;
    text-align: center;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

header .subtitle {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

footer a {
    color: var(--color-primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.warning-text {
    color: var(--color-warning);
    margin-top: 0.5rem;
}

/* ============================================
   Card Component
   ============================================ */
.card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.card.disabled-section {
    opacity: 0.6;
}

.card h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.card.warning {
    border-color: var(--color-warning);
    background: #fffbeb;
}

.card.warning h2 {
    color: var(--color-warning);
}

.card.info {
    border-color: var(--color-primary);
    background: #eff6ff;
}

.card.info h2 {
    color: var(--color-primary);
}

.card.info a {
    color: var(--color-primary);
}

.platform-list {
    margin: 0.75rem 0;
    padding-left: 1.25rem;
}

.platform-list li {
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.status-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.status-badge.supported {
    color: #166534;
    background: #dcfce7;
}

.status-badge.not-supported {
    color: #991b1b;
    background: #fee2e2;
}

/* ============================================
   Form Elements
   ============================================ */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
    color: var(--color-text);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.form-grid .full-width {
    grid-column: 1 / -1;
}

input[type="text"],
input[type="password"],
input[type="number"],
textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-family: inherit;
    transition: border-color 0.15s;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

input:disabled,
textarea:disabled {
    background: var(--color-bg);
    cursor: not-allowed;
}

textarea {
    min-height: 80px;
    resize: vertical;
}

.json-input {
    min-height: 120px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.message-input {
    min-height: 80px;
}

.signature-output {
    min-height: 60px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: var(--color-bg);
    word-break: break-all;
}

/* ============================================
   Buttons
   ============================================ */
.button-row {
    display: flex;
    gap: 0.5rem;
    margin: 1rem 0;
}

button {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.15s;
}

button.primary {
    background: var(--color-primary);
    color: white;
}

button.primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
}

button.secondary {
    background: var(--color-secondary);
    color: white;
}

button.secondary:hover:not(:disabled) {
    background: var(--color-secondary-hover);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   Status & Results
   ============================================ */
.status-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0.5rem 0;
}

.status-row .label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.status {
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
}

.status.disconnected {
    color: var(--color-error);
    background: #fef2f2;
}

.status.connected {
    color: var(--color-success);
    background: #ecfdf5;
}

.status.verified {
    color: var(--color-success);
    background: #ecfdf5;
}

.result-group {
    margin-top: 1rem;
}

.result-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.address-display {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    padding: 0.5rem 0.75rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    word-break: break-all;
}

/* ============================================
   Log Output
   ============================================ */
.log-output {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: #1f2937;
    color: #e5e7eb;
    padding: 1rem;
    border-radius: var(--radius);
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 1rem;
    min-height: 100px;
}

.log-output .log-entry {
    margin-bottom: 0.25rem;
    line-height: 1.4;
}

.log-output .log-entry.info {
    color: #93c5fd;
}

.log-output .log-entry.success {
    color: #86efac;
}

.log-output .log-entry.error {
    color: #fca5a5;
}

.log-output .log-entry.warn {
    color: #fcd34d;
}

.log-output .timestamp {
    color: #9ca3af;
    margin-right: 0.5rem;
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
    display: none !important;
}

.hint {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 600px) {
    .form-grid {
        grid-template-columns: 1fr;
    }

    header {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .button-row {
        flex-direction: column;
    }
}